题解 | #牛牛的书#

#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;

class Book {
  public:
    string name;
    double price;
    Book(string& name, double price): name(name), price(price) {}
};

bool book_sort(Book& a, Book& b) {
    return a.price < b.price;
}

int main() {
    int n;
    cin >> n;
    vector<Book> v;
    while (n--) {
        string name;
        double price;
        cin >> name >> price;
        Book b(name, price);
        v.push_back(b);
    }

    sort(v.begin(), v.end(), book_sort);

    for (auto b : v)
        cout << b.name << endl;
}